﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Hinh
{
    abstract class Hinh
    {
        public virtual void VeHinh()
        {
            Console.WriteLine("Ve Hinh");
        }
        public abstract void TinhDienTich();
        public virtual void TinhChuVi()
        {
            Console.WriteLine("Tinh Chu Vi");
        }
    }
}
